Nine strains of Vibrio parahaemolyticus from widely varied sources were exposed to heat in sterile clam homogenates. D-values were determined at temperatures ranging from 49 to 55 C for four strains, and at 51 C for the remaining five strains. The D-values in minutes, corrected for thermal lag and lethality during thermal lag, were 0.39 to 0.70 at 49 C. 0.26 to 0.54 at 51 C, 0.12 to 0.31 at 53 C, and 0.03 to 0.24 at 55 C. Values of z in degrees Centigrade determined for four strains were 5.6 to 12.4. One strain was found to be significantly more resistant at 53 and 55 C.

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